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  3.31 (8) Every part of a proposition which characterizes its sense I call an expression (a symbol). (The proposition itself is an expression.) Expressions are everything - essential for the sense of the proposition - that propositions can have in common with one another. An expression characterizes a form and a content. 3.32 (8) The sign is the part of the symbol perceptible by the senses. 3.33 (4) In logical syntax the meaning of a sign ought never to play a role; it must admit of being established without mention being thereby made of the meaning of a sign; it ought to presuppose only the description of the expressions. 3.34 (4) A proposition possesses essential and accidental features. Accidental are the features which are due to a particular way of producing the propositional sign. Essential are those which alone enable the proposition to express its sense. |